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i cant ge tthe fork tube and slider apart do you have to take out the allen bolt on the bottom of a 1987 yz250 the manual does not say any thing about it

Yes, the bolt attaches to the damper-rod, which is "captured" in the fork-upper, under the spring.

If it spins and won't come out - either reassemble the fork with the spring and try that, or jam a wooden dowel or broomstick inside the upper into the back of the damper-rod to keep it from spinning.

Don't lose any washers or spacers, and pay close-attention to how and where the spacers go in, and how the topout-spring goes in as well - it maymatter if it goes-in one way or another, or it may not. Some are tapered slightly. Depends on the fork.

__________________Parfois, on fait pas semblant Sometimes, it's not pretendOderint Dum MetuantLet them hate so long as they fearполитики предпочитают безоружных крестьянPoliticians Prefer Unarmed Peasants
Nothing to see here, Citizen. Move along now...

Easiest way to do any of the damper tube-style forks is with an air impact wrench. It'll spin the bolt out, and it'll also spin it back on without the necessity of "jamming" the tube from the other end.

As soon as the bolt grabs (tightens), come off it with the air wrench, and torque it by hand.

A trick I've found is to use an old fashioned seal puller to get the seal out and skip the fork disassembly. I've used this method on my Concours and V-Strom without problem. Make sure to get the seal wiper out first though or you'll wreck it. Probably ought to replace it anyway though.

__________________
What kind of man can abandon his family like that?
Seriously, who is he, I'd like lessons.

A trick I've found is to use an old fashioned seal puller to get the seal out and skip the fork disassembly. I've used this method on my Concours and V-Strom without problem. Make sure to get the seal wiper out first though or you'll wreck it. Probably ought to replace it anyway though.

Most OEM seal-kits come with both seals and both new wipers.

AVOID LIKE THE PLAGUE THE "LEAKPROOF"-BRAND SEAL KITS!

This is not an Option, crosbymudray! Just say "No" to aftermarket crap here; you're wasting your money otherwise.

__________________Parfois, on fait pas semblant Sometimes, it's not pretendOderint Dum MetuantLet them hate so long as they fearполитики предпочитают безоружных крестьянPoliticians Prefer Unarmed Peasants
Nothing to see here, Citizen. Move along now...